Trimming mechanism for grinder-wheels of shaft-grinding machines.



F. A. WARD. TRIMMING MECI-IANISM FOR GRINDER WHEELS OF SHAFT GRINDING MACHINES.

APPLICATION FILED AUG- I3, I912.

Patented Oct. 5, 1915,.

3 SHEETSSHEET I.

//I/ VE/I TOR z? TTUR/I/EYS IIlullIIIlll WITNESSES:

F. A. WARD.

APPLICATION FILED AUG. 13, 1912.

Patented Oct. 5, 1915.

3 SHEETS-SHEET 2.

lag-Q ATTORNEYS F. A. WARD. TRIMMING MECHANISM FOR GRINDER WHEELS 0F SHAFT GRINDING MACHINES.

APPLICATION FILED AUG. I3, I912.

Patented Oct. 5, 1915.

3 SHEETSSHEET 3.

WITNESSES. M fr 9 nnrrnn snares PATENT OFFICE;

FREDERICK ALEXANDER WARD, 013 DETROIT, MICHIGAN, ASSIGNOB. TO GEAR GRINDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

Specification of Letters Patent.

Patented Oct. 5, 1915.

Application filed August 13, 1912. Serial No. 714.811.

To all whom it may concern:

Be it known that, I, FREDERICK A. WARD, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Trimming Mechanism for Grinder-Wheels of Shaft-Grinding Machines, of which the fo lowing is a specification, reference being h d therein to the accompanying drawings.

The invention relates to trimming mechanism for grinder wheels of shaft grinding machines, and has for its object the obtain ing of a construction adapted to accurately grind interrupted or obstructed cylindrical surfaces.

More particularly, it is the object of the invention to provide means for trimming a grinder to adapt the same for grinding splineshafts, such as are used in the construction of sliding gear transmission mechanisms and for similar purposes.

In the drawings: Figure 1 is a side elevation of the machine. Fig. 2 is a side elevation of one member of the trimming mechanism. Fig. 3 is a sectional end elevation thereof. Fig. 4 is a longitudinal section through another memberof-the trimming mechanism. Fig. 5 is an end elevation thereof. Fig. 6 is a cross section showing the grinder in engagement with the work.

My machine comprises broadly a workholder and a grinder havinga relative reciprocatory movement parallel to the axis of theowork, an indexing-mechanism for accurately adjusting the work rotatively, and" a trimming mechanism by which the periphery of the grinder may be fashioned to the exact contour desired. This trimming mechanism includes a concave trimmer the v radius of which may be adjusted to correthe other.

In detail, A is a supporting bed or frame,

upon which is mounted the reciprocatory work-table B and which is further provided with an upward extension C, upon which a vertically adjustable head D is mounted carrying the arbor E for the grinder F.

r G is a suitable work holder and indexing mechanism mounted upon the bed, it being provided with a work holding center H adapted to cooperate with a similar work holding center H upon a support. G. An adjustable clamp K is positioned on the end of the work to drive the same, it having a releasable engagement through the medium of'the lug J with arotatable head I. The indexing mechanism may be of any suitable construction (not shown), being provided with means for intermittently rotating the work through the desired angle, such as the crank handle L. Thus by suitably adjusting the mechanism the work may be successively partially rotated to present difi'erent segments to the action of the grinder.

The trimming mechanism comprises an arc trimmer M and edge trimmers N. The former is provided with a rotatively movable shaft 0 mounted in a bearing P, the axis of said shaft being in the same plane as the longitudinal axis of the work.

Q is a diamond holder which engages a transversely extending recess in the shaft 0 and is adjustably secured in position by a set screw R.

S is a gage engaging a supporting arm or bracket S and adjustably secured by a set screw S in the transverse plane of the holder Q, the arrangement being such thatbyfirst setting the gage the diamond may be ad usted by moving it into contact with the gage and then securing the holder by the set screw R.

The edge trimmer N comprises a pair of oppositely angling guide arms T and T, upon which reciprocating heads U are mounted, being adjustable by suitable means such as the rack bars U pinions U and operating wheels U Each of the heads U is provided with a diamond or other trimmer means holder V which is adjustable transversely of the head by suitable means 'such as a threaded engagement with a threaded socket. The arms T and T are mounted upon a vertically adjustable shank T which is secured in a socket member W upon the base, the arrangement therefor permitting of simultaneously adjusting both the arms T and T vertically to change the relation to the trimmer M, and also permitting of exchanging the member having the arms T and T where a different angular relation for the trimmers is desired. The vertical adjustment of the shank T may be effected by an adjusting sc rew X engaging an ear X and bearing against the base. With .the construction of the trimming mechanism just described, where it is desired to prepare the machine for grinding a splined shaft, such for instance as shown in Fig. 6, the trimmers M and N are first set. The trimmer M may be set by adjusting the gage S in relation to the shaft Q, so that the distance from the axis of the shaft to the gage exactly corresponds to the radius of the cylindrical portion of the finished work. The diamond or trimming means is then adjusted to the gage. In adjusting the trimmer N a member having arms T and T of the desired angle is first selected and engaged with the holding socket TV, after which the holders V are properly adjusted in the reciprocatory heads U and the shank T is vertically adjusted in the socket W. Where the diamond holders. are adjusted with their cutting points the same distance from the guide arms T the setting of both. guides is effected by the vertical adjustment of the-shank T? by means of the adjusting screw X. Thus the two trimmers M, and N will conjointly fashion the grinder medium to the exact form desired.

In trimming the wheel the table B: is moved longitudinally to carry the diamond or other trimmer means holder to a central position under the grinding wheel arbor and the head D is adjusted to carry the arbor toward the trimmers until the periphery of the wheel is properly fashioned by the move ment of the trimmers. The machine is then adjusted to reciprocate the work in relation to the grinder, and after each reciprocation the indexin mechanism is operatedto rotatively adjust the work, whereby the different segments of the surface are successively ground. The operation is continued with a gradual adjustment of the head I) until the center of the arc portion of the grinding surface coincides With the axis of the work, or

in other words, until the cylindrical portion of the Work is reduced to the proper size which may be determined by 1neasurement.-

It is however desirable before finally finishing the work to re-trim the grinder so that duringthe finishing out the grinder is of the exact complementary'form.

While I have described the use of my machine for the specific purpose of grinding splined shafts, it is obvious that it is applicable for various other uses.

It is obvious that the required result may be accomplished by the reciprocation of either. work or grinding medium and that in feeding to reduce the-Work to size either the work or grinding medium may be moved toward the other which has a fixed position.

The terms cylindrical and are are used in the specification and claims generically as including other curves than a true circle.

\Vhat I claim as my invention is;

1. The combination with a rotary grinder wheel of a reciprocatory work-holder and trimming mechanism for saidv wheel, comprising a concave forming trimmer centered parallel to the longitudinal axis of said work-holder and provided with means for adjusting the radius of the arc, and an edge trimmer provided with divergent arms and trimming points movable on said arms.

2. In a machine of the character described, trimming mechanism for the grinder wheel, comprising a rotatable shaft having its axis of rotation parallel to the longitudinal axis of the work, a trimming point and a holder for the trimming point laterally, adjustably secured to said rotatable shaft, and a second trimmer provided with divergent guide arms and trimming points movable along said guide arms for the purpose described.

3. The combination with a rotary grinder wheel and a relatively reciprocatory workholder of a trimming mechanism for the grinder wheel, comprising a rotatable member having its axis parallel to the longitudinal axis of the work, a radial adjustable trimming-point holder secured to said intatable member and an exchangeable trim mer having divergent guide arms and trimming points movable thereon, saic guide arms being adjustable in relation to the axis of the rotative trimmer for the purpose described- 4. The combination with a rotary grinder wheel and a relatively reciprocatory workholder, of a trimmer, comprising a rotatable member having its axis parallel with the longitudinal axis of the work, a radially adjustable trimming point securedto said rotatable member, a member having a shank adjustable toward and from the axis of said rotatable member, and a pair of divergent guide arms and trimming points movable upon said guide arms for the purpose described.

5. A trimming mechanism for grinder wheels of shaft grinding-machines, comprising means for trimming a concave segment in the periphery of the grinder wheel, exactly corresponding to a segment of the finished Work, the center of said trimming are being in alinement with the axis of the shaft being ground.

6. A trimming mechanism for grinder Wheels of shaft grinding-machines, comprislit:

ing means centered parallel with the longitudinal axis of the work for trimming a con -of the cylindrical portion'of the finished work ground by said grinder wheel, and divergent edge-trimmers for fashioning the portions of the grinder wheels at opposite ends of the concave portion and for limiting the length of arc of the latter.

8. A trimmer mechanism for grinding wheels of shaft grinding machines comprising means for holding the work to be ground and a grinding wheel, means for trimming a concaved segment in the periphery of the grinding Wheel exactly corresponding to aseginent of the finished work, the center of said trimming arc being in alinement with "the axis of the shaft being ground, and

means for mounting the trimming means whereby the wheel can be trimmed without removing the work from its holders.

. 9. In a shaft grinding machine, the combination with a shaft holder and a grinding wheel, adapted to relatively reciprocate, and

a trimmer for the grinder wheel pivotally mounted on the machine independently of the work holding points and having a center in alinement with the axis of the shaft being ground. I

10. In a shaft grinding machine, the com-. bination with a rotary grinder wheel and re ciprocatory work-holder, .of a trimming mechanism comprising means for trimming a concave segment in the periphery of the grinder wheel complementary to a predetermined segment in the finished work, and a mounting for said trimmer in exactly predetermined relation to said grinder, such that the trimmed segment in said wheel is registerable with said predetermined segment in the finished work.

11. In a machine for grinding splined shafts, a grinder wheel having a grinding surface arranged to correspond with the space between the splines, means on the machine adapted to be moved into and out of operative position with the grinding wheel for trimming a concave segment of the grinding surface of the wheel to fashion the same to accord with the shape of the finished work between the splines and means for moving said trimming means in an are.

12. In a splined shaft grinding machine, the combination with a grinding Wheel and a bed, of means for trimming a concaved segment in the periphery of the grinding wheel exactly corresponding to a segment of the finished work comprising an oscillatory support for the trimming means, the center of said trimming arc-being in alinement with the axis of the shaft being ground and side trimming means associated with said other means and mounted on said bed.

13. The combination with a rotary grinder wheel and a reciprocatory work-holder, of trimming mechanism comprising means for trimming a concave segment in the periphery of the grinder wheel complementary to a predetermined segment in the finished work, edge trimming means for limiting the length of the segment and fashioning adjacent portions of the grinder, and a mounting for said trimming mechanism in exactly predetermined relation to said grinding machine, such that the trimmed segment in the grinder wheel is registerable with said predetermined segment in the finished work.

14. In a shaft grinding machine, the com- .bination with shaft-holding centers and a grinder wheel, of means for relatively reciprocating the same, and a concave trimmer for the grinder Wheel mounted on the machine independently of said work-holding centers and so positioned that the trimmed segment is registerable with a predetermined segment in the finished work.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK ALEXANDER WARD. -Witnesses:

KATHLEEN M. THOMPSON, ERNEST HARPER. 

